Notes:
"48 States" is the United States excluding Alaska and Hawaii. "48 States, Offshore" are Federal and State Jurisdiction waters of the Gulf of Mexico. Alaska is all onshore. Total crews includes crews with unknown survey dimension. Data are reported on the first and fifteenth of each month, except January when they are reported only on the fifteenth. When semi-monthly values differ for the month, the larger of the two values is shown here. Consequently, this table reflects the maximum number of crews at work at any time during the month.
See Definitions, Sources, and Notes link above for more information on this table.